Objective: To study the pharmacodynamic effect of Reganling Oral Liquid(RGL) in treating wind heat epidemic syndrome. Methods: After RGL was administered ig to experiment animals, we observed its antifebrile effect by using pathologic hectic rabbit caused by typhoid bacterin and pathologic hectic rat caused by injection of 2,4 dinitro phenol, anti inflammation effect by weighing the tampon acestoma in rat, anti anaphylaxis effect by using delay anaphylactoid mice caused by injection of 2,4 dinitrochloro benzene. The Liquid Tube Observing Method was used to investigate the bacteriostatic activity of RGL on eight kinds of germina in vitro . Results: RGL could evidently inhibit the raising of animal heat caused by bacterin and chemical, and also could markedly restrain the weight of tampon acestoma in rat and delay anaphylactoid in mice. RGL also had remarkably bacteriostatic activity on eight kinds of germina in vitro which mainly caused wind heat epidemic syndrome. Conclusion: RGL had the evident effects of antifebrile, anti inflammation, anti anaphylaxis and bacteriostatic activity in vitro .